Patent GB-190613157-A (GB)
Title: Improvements in and connected with Phonographs.
Inventor: DURAND EUGENE
Filed: 1906-06-07
Granted: 1907-02-21
Abstract: 13,157. Durand, E., and Gaggero, C. H. June 7. Advertising.- Phonographs f or advertising purposes reproduce sentences at predetermined intervals, the m o t o r and record being stopped between each reprodnction, and the sound-box returned to its initial position after the series of sentences has been reproduced. Fig. 1 shows a general side elevation, Fig. 3 an elevation of the mechanism for returning the soundbox to its initial position, and Fig. 5 a detail of the same, Fig. 10 is a plan of the reproducer-controlling mechanism, Fig. 12 is an elevation of a secondary electric switch, and Figs. 14 and 17 are elevations of mechanically-operated electric switches. A record b mounted on a mandrel b<1> is rotated from a motor b<2>. A soundbox a pivoted at a' to the tone arm a', which is again pivoted at a<3>, is normally supported in a raised position by a rod a<5> provided with a fine edge a<7> engaging a traversing-screw h, the rod a<5> being itself supported by a rod o connected by a series of levers 0<1>, g<1>, f<5>, f<4> to a rocking lever f<3> having a balance weight f<2> on one side and a movable core f<1> of a solenoid f on the other When the switch is operative, the motor b<2> is started and the solenoid f in parallel with the motor energized, thus drawing in its core f<1> and lowering the sound-box upon the revolving record and bringing the rod a<5> in contact with the traversing-screw. When one sentence is reproduced, the mechanically - controlled switch breaks the circuit, stopping the motor and record, and allowing the balance weight f<2> to raise the solenoid core and the sound-box, a small adjustable stop a<6> preventing the sound-box from turning on its pivot a'. A serrated plate i carried by the solenoid core f<1> engages with a frame i<1> on the tone arm a<2> between each sentence, thus ensuring the return of the sound-box to its correct position on the record. When the sound-box reaches the end of the record, a lever j, having a hooked top j<3> and pivoted to the rod a<5>, is tilted forward by a rotating projection on the traversing-screw h and held in a raised position, Figs. 3 and 5, by a spring-controlled lever m that it has compressed, until the hook j<3> is engaged by a pin k in a rod k<1> reciprocated by a crank k<2> driven from the traversing-screw, and with it the arm as and sound-box a returned to their initial position, a projection j<4> on the lever j engaging in a spiral cam returns the lever j to its correct position. One form of switch, shown in Fig. 14, consists of a rod d' pivoted at d<2> and constantly rotated by clock-work in the case d in the direction of the arrow. Levers d<3> are pivoted at the ends of the rod d<1>, so that at regular intervals one of them falls over between a pair of contacts, of which d<6> is one. The time taken for the arm d<3> to be drawn through the contacts is the time required for the reproduction of one sentence. To prevent the motor from stopping when the record is being brought back to its initial position, a secondary switch, Fig. 12, in parallel with the first switch is operated when the arm a<5> is raised by the projection h<2> by making a contact between the points o<5>, o<6> on the rods o, o<2>. To stop the motor when the soundbox has reached its initial position, should the clock-work switch remain operative too long and thus partly reproduce the first sentence, the frame i<1> on the tone arm a' engages a weighted arm e<4> connected to the switch contacts and withdraws the latter from the lever d<3>, the tone arm a<2> having been sufficiently lowered in the latter part of the carrying-back operation to break contact at the secondary switch. A second form of clock-work switch, shown in Fig. 17, consists of a revolving arm p carrying a plunger p' pressed outwards by a spring p<3> against a spiral plate q, the plunger p<2> touching a contact - plate r mounted between rollers r<1> and adjust ably connected with a rod e as before.